Last Updated: August 31, 2012 9:20am
Roddick: will quit tennis at the culmination of the US Open
Andy, who will hang up his racket at the end of the US Open, is a great competitor and a great personality and has a great sense of humour, but he probably never got the credit he deserved in America as he came in a generation after Pete Sampras, Andre Agassi, John McEnroe, Jimmy Connors, Jim Courier - lots of number ones who won multiple slams.
He won the 2003 US Open and people were thinking he would go on to dominate the sport and win major after major. Unfortunately for him Roger Federer and Rafa Nadal turned up but he maximised everything he had and to be in the top 10 for 10 years in a row is a phenomenal accomplishment.
It's hard when you've been at the top for so long and then you are about 22 in the world, doing okay in the smaller events but not so well in the majors so I think he has made the right decision to call it a day; he should enjoy his retirement and look back on his career fondly.
Tsonga didn't play well; he was too far back in the court and didn't serve well enough and found it tricky against a lefty. But you have to give credit to Klizan; he really went after it and the more aggressive and positive of the two players. He held his nerve and found a way to get through and secure the biggest win of his career by far.
Tsonga has spoken about getting into the top four but both mentally and strategically against Klizan he wasn't very good. There is so much to improve and he needs to go and get a top-notch coach because if he played the percentages, rather than going for the crazy shots, he would most likely have won the match, even if he was only at 75-80 per cent of his game. His unpredictability can be a strength but also a weakness.
Annabel: We need new names in both the men's and ladies' game as in the late 1990s and early 2000s we were used to new names breaking through - Andy Murray and Nadal surged into the top 10 pretty quickly - but it hasn't happened for quite some time.
Roddick thinks that is down to the physicality of the game and the fact you have to be strong to cope with the Tour and withstand the pressure day in, day out. It does take more time for these players to emerge and develop, but perhaps Klizan, who is only 23, can do that.
Greg: There is not much variety in the men's game; everybody is playing the same way and the top guys just do it a little bit better. So it's not like the old days where you could break through because you were a serve-volleyer or good on a certain surface. Everything is the same these days.
Raonic has a massive serve but I want to see him taking more risks. He plays a metre or so behind the baseline and I don't see him moving up and down the court enough.
His serve means he can get away with it move into the world's top 10 but to win one of these events - and people have talked him possibly winning a major - he needs to move forward, as against the likes of Murray and Novak Djokjovic who return so superbly, you have to put immense pressure on them and make them feel uncomfortable.